Governor for prime movers



March 3,. 3- M. CRAFTS arm. 2,314.341

GOVERNOR FOR PRIME MOVERS Filed Aug. 17, 1940 2 Shasta-Sheet 1 March 23, 1943.

I. M. CRAFTS ET AL GOVERNOR FOR PRIME MOVERS Filed Aug. 1'7. 1940 2 Sheets-Sheet 2 Patented Mar. 23, 1943 2,314,841 GOVERNOR FOR PRIME MOVERS Irving M. Crafts, Portland, and Charles B. Taylor,

Middletown,

Governor Company, Portland, Conn, a

ration of Connecticut Conn, assignors to The Pickering Application August 17, 1940, Serial No. 353,098

25 Claims.

Our invention relates to the class of devices which are employed for regulating the speed of power generating mechanisms, and an object of the invention, among others, is to provide a mechanism of this type that may be regulated to maintain uniform speeds under varying conditions and that shall be particularly effective in the production of maximum results for which it is contemplated.

One form of a governor embodying the invention and in the construction and use of which the objects herein set out, as well as others, may be attained is illustrated in the accompanying drawings, in which- Figure 1 is a diagrammatic sectional view in perspective of the lower part of our improved governor.

Figure 2 is a similar view of the upper part of said governor.

In the accompanying drawings the mechanism is shown in the position it will assume when the engine or prime mover is running at its normal speed, the numeral 5 denoting a fly-ball head rotatably mounted and driven by the engine through a torsionally flexible drive 5 of any well known character. In the arrangement herein shown the shaft of the torsionally flexible drive has a gear I secured to it at one end and its opposite end is connected through the flexible element of said drive with a governor shaft 8. Fly-weights 9 are pivotally mounted on the head in a manner common to governor construction and are yicldingly held in a lowered position by a spring I extending between said weights. Radial movement of these weights causes a main pilot valve H to move up or down in response to speed changes in the engine.

The gear I may be connected directly with the engine or it may be connected in the manner herein shown in which said connection is made through a gear oil pump comprising pump |2-|3. the former connected by a transmission shaft H and a gear with the gear 1, and the latter being secured to a pump driving shaft I6 having a gear |1 driven by power derived from the engine. This pump is the source of energy for operating power pistons to be hereinafter described, said pump comprising a reservoir l8 from which oil or other liquid is drawn in to the chamber containing the pump gears |2-|3 past a ball check valve l9, said liquid being discharged under pressure past a ball check valve 2!] into a pressure accumulating chamber 2|. Ball check valves 22-23 are arranged in the valve chambers 24-25 to function as automatic reversing valves to permit rotation of the pump in the opposite direction and flow of liquid through passages 26-26 to the pressure accumulating chamber 2| in a manner which will be readily seen.

A spring loaded piston 2'! in the pressure chamber 2| acts as a relief valve to discharge oil through a relief port 28 into the reservoir l8 when the pressure in the chamber 2| becomes excessive. This chamber thus holds a suiiicient quantity of oil under pressure to meet momentary demands of the governor which may be in excess of the instantaneous rate of pump output.

The main pilot valve II has lands 29-30 operating to cover and uncover ports 3l-32 and 33-34 in a stabilizing bushing 35, in a valve chamber in which the main pilot valve H is located and has reciprocating and rotating movement. The stabilizing bushing 35 is located within a speed droop bushing 36, said bushings constituting the lower portion of a main valve system. A main oil supply passage 31 leads from the pressure chamber 2| and opens against the speed droop bushing 35 in a bushing chamber 38. A branch 39 from said oil supply passage leads into an annular bushing chamber 38 extending around the bushing 36 at the upper part thereof. Passages 4|I-4| for oil lead from the upper sides of chambers containing power piston s, to be hereinafter described, into an annular bushing chamber 38", and passages 42-43 lead from the bottoms of said chambers on the opposite sides of said power pistons into an annular bushing chamber 38" in said bushing 36. A throttle power piston 44 is located in a power piston chamber 45 and is connected by a piston rod 46 and a link connection with a throttle lever 41 secured to the throttle shaft 48 rotatably mounted in the support for the mechanism being described. The throttle lever 41 has a roller 49 riding in a slot in a connecting lever 50 pivotally mounted on a supporting sector 5| which is pivotally mounted by a pivot 52 on a stationary support. The lever 5|! has a roller 53 riding in a slot in a lever 54 pivotally mounted on the upper end of a piston rod 55 of a compensator piston 56 mounted in a compensator piston chamber 51 formed in the governor structure.

The lever 54 carries a trunnion pin mounting a roller 58 which rides upon a disk 59 secured .to the upper end of a compensator valve 60 screw threadedly engaged with the shank 8| of the stabilizing bushing This compensator valve controls ports 62-63 in the outer valve or speed droop bushing 35, said ports opening to passages 5455 leading into a valve chamber 66 containing an immovable timing member 61 with restricted channels 51' for flow of oil to and from the compensator piston chamber 51 to time the movement of the compensator piston 56. This timing member is of cylindrical form with an enlarged central part to fit the chamber 66 and with ends reduced in size to form the channels 91 which restrict the amount of flow to and from the chamber 51 and thus regulate the rate of movement of the compensator piston 55. The speed droop bushing 35 is supported at its upper end by means of a disk 68 having an arm 69 carrying a roller riding in a slot in a sliding bearing 1| mounted on a pivot 12 carried by a bell crank lever presently to be described. The bearing 1| has an arm 13 having a slot 14 which receives a roller 15 mounted on the side of a second throttle lever 16 secured to the throttle shaft 18. One end of the lever 16 has a link connection with the piston rod 11 of a second power piston 18 mounted in a piston chamber in the governor structure. This piston chamber 19 is connected by the passages 4l-43 with the bushing chambers 38" and 38", respectively, as hereinbefore described.

The bell crank lever hereinbefore referred to comprises an arm 80 and a bar 8| mounted on a pin 80' fixedly secured in the governor frame said arm carrying the pivot 12 for the sliding bearing 1i hereinbefore referred to and the bar 8| having a slot 82 which receives a roller 83 mounted on a stud on the side of a threaded adjusting sleeve 84. An adjusting spindle 85 is rotatably mounted in a fixed bearing and threadely engages within the sleeve 34 and carries a knob 85 for hand manipulation for the purpose of turning the spindle and vertically adjusting the position of the sleeve 84. The shank 61 of the stabilizing bushing 35 has an adjusting rod 81 engaged therewith and having an adjusting knob 88 by means of which said shank may be turned to adjust the position of the stabilizing bushing 35 relatively to the compensator valve for setting the speed adjustment. The rod 81 is connected by a. gear train 89 with a dial 99. This dial is adjustably mounted relatively to the rest of the mechanism and may readily be released by backing oil a clamping collar 9!. A zero mark is provided on the dial to indicate its normal position in a manner common to structures of this pe.

The sector 5| may be adjusted on its supporting pivot 52 by means of an adjusting screw 92 mounted in the governor frame and screw threadedly engaged with a threaded edge of the sector for changing the positions of the points of engagement between the throttle lever 41 and the lever 50 and also between said lever 50 and the lever 54. The end of the adjusting screw may be provided with a head 93 to receive a wrench as a means for rotating the screw to provide for said adjustment.

It will be noted that the mouths of the several ports in the bushings and 36 are enlarged to provide for the necessary movements of said bushings for the purposes required of the structure.

Governor operation speed.

Upon an increase of speed the fly weights 9 move outward causing the main pilot valve H to move downward uncovering the ports 3143 and 3234 in the stabilizing bushing 35. This admits oil from the main oil passage 31 and permits it to flow through the ports 3i-33 to the under side of the throttle power pistons -18, forcing these pistons upwardly. Oil on the upper sides of said pistons is discharged through the passages fill-4| and the ports 3234 in the bushing 35 and registering ports in the bushing 39 to the upper side of the chamber containing the main pilot valve II and through an orifice 94 into a chamber and thence by way of a port 96 and a passage 91 back to the pump reservoir I8, the portion of said passage next to the port 96 only being shown. The power pistons 44 and 18 being directly connected to the throttle levers 41 and 16 cause the throttle shaft 48 to rotate in a direction to close the engine throttle. The degree of throttle shaft movement is limited and stabilized by relay action as follows:

Stabilizing relay Upward movement of the power piston 44 and the outer end of the throttle lever 41 rotates the connecting lever 50 on its pivot on the sector 5|, and the movement of the lever 50 is thus transmitted to the lever 54. The outer end of the le ver 54 is thus moved downwardly pressing the roller 58 against the disk 59 thereby moving the valve system comprising the compensator valve 50 and the stabilizing bushing 35 downwardly. Thus upward movement of the power piston 44 in eifecting downward movement of the valve system also causes a similar movement of the ports 3l33 which were opened by the downward movement of the main pilot valve hereinbefore mentioned. The power piston 44 will continue to move upwardly until said ports 3l35, originally opened by change of speed, are again closed. This will prevent further movement of the power pistons and consequently will stop rotation of the throttle shaft 48 and the degree of movement of said shaft produced by a given degree of speed change is therefore determined by the proportions of the relay. Movement of the shaft 48 to close the throttle causes a reduction in the speed oi the engine to some value below the original increase and this reduction in speed causes the fly weights to reverse their original movement and thereby move the main pilot valve H upward. This return movement of said pilot valve would cause the power pistons to reverse their movements and again open the throttle but this is prevented by means of a dash pot compensator acting as follows:

Dash pot compensator The compensator valve 60 controls the flow of oil through the ports 62-63 located in the upper end of the speed droop bushing 36. When the valve system was moved downwardly as hereinbefore described by action of the roller 58 said valve uncovered the ports 62-63, permitting the oil pressure in the branch 39 of the oil passage to flow through the passage 64 past the timing member 61 into the chamber underneath the compensator piston 56 and the oil on the upper side of said piston is discharged past the timing valve through the passage 65 over the upper end of the valve 60 and thence to the oil reservoir l8 through a passage arranged in any ordinary manner but not shown. The piston 56 is thus caused to move upwardly rotating the lever 54 about its sliding hearing or roller 53 on the connecting lever 56. The roller 58 is thereby caused to move upward and this permits the valve system to rise. It should "be noted that oil flowing to and from the piston 56 must pass through the restricted channels formed by the reduced ends of the timing member 61 and between said reduced ends and the walls of the chamber 66 thereby controlling the rate of movement of 'said piston. Therefore as the main pilot valve H is moving towards its original position, as already described, the stabilizing bushing 35 is also moving in the same direction and approximately at the same rate. As the piston 56 will continue to move until the valve ports 6253 are again covered by the compensator valve 60 the final point of stability for the valve system is identicalwith its original position. This is so because the position of the speed droop bushing 36 which contains the ports 6263 is fixed when the governor is to be used for isochronous regulation and a hereinbefore described.

Speed droop The term speed droop" is used to denote the change in speed that occurs when the engine is running under no-load conditions as compared with the speed under full-load conditions. This speed droop mechanism acts as follows:

The speed droop bushing 36 is supported as hereinbefore stated by a disk 68 having an arm 69 containing a roller Ill located in a slot in an adjustably mounted support for said disk. This support comprises the bearing Ii hereinbeiore mentioned which is in the form of a block rigidly supported by the arm 13 through the medium of a sleeve mounted on the pivot 12, the block and bearing ll therefore directly supporting said bushing. This support for the disk 66 being mounted on the pivot 12 of the bell crank lever comprising the arm 80 and bar Bi enables the position of the support to be adjusted for a purpose to be presently described, in this movement the support having a sliding movement relatively to the lever 16 and arm 69. this sliding movement taking place upon the rollers I and 15. It is to he noted that a spring is interposed between the disks and 68, the force of the spring being exerted in opposite directions on said disks. The bell crank lever is rotatably mounted on the pin 80 secured to the frame of the governor mechanism. Pivotal movement on said pin is for purposes of adjustment which is effected by vertical movement of the adjusting sleeve 84 on the threaded adjusting spindle 85, thereby carrying the sliding bar 8| up or down when the adjusting spindle B5 is rotated as by means of the fluted knob 66. Therefore if the throttle lever 16 is rotated by vertical movement of the power piston 13 a similar rotation is imparted to the arm 13. When the position of the bell crank lever is adjusted such that the center line of the pivot 12 is coincident with the center line of the pivot of the roller 10 rotation of the arm I3 will impart no movement to the speed droop bushing 36. If, however, the bell crank lever is adjusted to a position to place the bearing 12 out of line with the sliding bearing Hi then vertical movement will be imparted to the bushing 36 as the power piston 18 is moved. The mechanism is so constructed that when the piston moves toward throttle closing position due to load reduction on the engine the bushing 36 is moved in a downward direction. The positions of the ports 62-63 are thus moved downward and the point of stabilization of the valve system is thereby set at a higher speed position. This mechanism is for the purpose of permitting speed droop by the action of the governor to such extent as may be desired.

Speed adjustment The speed at which the governor will regulate the engine may be adjusted as follows:

The relative spacing between the compensator valve 60 and the stabilizing bushing 36 may be adjusted by means of the threaded screw on the shank 6| of said bushing. By thus moving said bushing up or down relatively to the fixed ports 62-63 the neutral position of the main pilot valve H is similarly moved up or down. Consequently the fly-ball element must rotate slower or faster to bring the valve ii to the neutral position. Said shank containing the threaded screw may be rotated by means of the rod 81 to which the adjusting knob 88 is attached. The indicating dial 9-!) will denote the setting of speed adjustment.

Adjustable relay In the description heretofore given it is set out that the proportions of relay determine the degree of throttle movement produced by a given degree of speed change. To secure the best operation from the standpoint of stability it is desirable to be able to adjust these proportions to suit individual operating conditions peculiar to en gine characteristics. This adjustment may be obtained as follows:

The connecting lever 56 is pivotally mounted on the sector 5! as before described and the sector is mounted on the pivot 52 and may be rotated by means of the adjusting screw 32. It will therefore be seen that ii the sector is rotated so that the point for the pivot oi the connecting lever 56 is moved toward the sliding roller 49, the effective radius oi the lever 56 from its pivot to the sliding roller 49 is shortened. Thus the throttle lever 61 and consequently the throttle shaft 68 must move a lesser distance to produce the same amount of movement of the roller 49 to effect closure of the ports 3i-32. By this means it is possible to secure the proper amount of power piston or throttle movement to produce the most stable action. When the final adjustment is obtained a lock nut 98 holds the sector rigidly in that position and a pointer 99 may be employed to indicate the setting of adjustment. Thus provision is made in this construction to vary the proportions of the relay mechanism.

In accordance with the provisions oi the patent statutes we have described the principles of operation of our invention. together with the device which we now consider to represent the best embodiment thereof 1 but we desire to have it understood that the device shown is only illustrative and that the invention may be carried out by other means and applied to uses other than those above set out.

We claim:

l. A governor mechanism including a motor driven centrifugally operated member, a main valve member operatively connected with said centrii'ugally operated member, a ported stabilizing member within which said main valve member is located, a piston located in a piston chamber. passages opening from said chamber on opposite sides of said piston. the ends of said passages opposite said chamber being located for opening and closing by said main valve member, a throttle operating lever operativcly connccted with said piston, a pivotally mounted lever connected at one end with said throttle operating lever, an operative connection between the opposite end of said pivotally mounted lever and said stabilizing member for movement of the latter simultaneously with and in the same direction as that of movement of said main valve member and means for changing the point of connection between said levers to vary the amount of movement of said stabilizing member.

2. A governor mechanism including a motor driven centrifugally operated member, a main valve member operatively connected with said centrif'ugaliy operated member, a ported stabilizing member within which said main valve member is located. a piston located in a piston chamber. passages opening from said chamber on opposite sides of said piston, the ends of said passages opposite said chamber being located for opening and closing by said main valve member, a throttle operating lever operatively connected with said piston, a pivotally mounted lever connected at one end with said throttle operating lever, an adjustable movable mount for said pivotally mounted lever to change its point of connection with said throttle operating lever, and an operative connection between the opposite end of said pivotally mounted lever and said stabilizing member for operation of the latter simultaneously with and in the same direction as that of movement of said main valve.

3. A governor mechanism including a motor driven ccntrifugally operated member, a main valve member operatively connected with said centriiugally operated member, a ported stabilizing member within which said main valve memher is located, a piston located in a piston chamber, passages opening from said chamber on opposite sides of said piston, the ends of said passages opposite said chamber being located for opening and closing by said main valve member, a throttle operating lever operatively connected with said piston, a pivotally mounted sector, a connecting lever pivotally mounted on said sector and engaged at one end with said throttle operating lever, and an operative connection between i the opposite end of said connecting lever and said stabilizing member for operation of the latter simultaneously with and in the same direction as that of movement of said main valve.

4. A governor mechanism including a motor driven centrifugally operated member, a main valve member operatively connected with said centrifugally operated member, a ported stabilizing member within which said valve member is located, a piston located in a piston chamber, passages opening from said chamber on opposite sides of said piston, the ends of said passages opposite said chamber being located for control by said valve member, a throttle operating lever operatively connected with said piston, a pivotally mounted sector, a connecting lever pivotally mounted on said sector and having a slotted engagement at one end with said throttle operating lever. a stabilizing lever, a slotted engagement between said stabilizing lever and the opposite end of said connecting lever, and an operative connection between said stabilizing lever and said stabilizing member for operation of the latter simultaneously with and in the same direction as that of movement of said valve.

5. A governor mechanism including a motor driven centrifugally operated member, a main valve member operatively connected with said centrifugally operated member, a ported stabilizing member within which said valve member is located, a shank extending from said stabilizing member, a piston located in a piston chamber, passages opening from said chamber on opposite sides of said piston, the ends of said passages opposite said chamber being located for control by said valve member, a throttle operating lever operatively connected with said piston, a stabilizing lever, a pivotally mounted sector, a connecting lever having slotted engagement at its opposite ends with said throttle operating lever and with said stabilizing lever to permit movement of said connecting lever by said sector to change the points of engagement between said connecting lever and said throttle and stabilizing levers, a disk secured to the shank of said stabilizing member, and a connection between said stabilizing lever and said disk for operation of said stabilizing member simultaneously with and in the same direction as that of movement of said main valve.

6. A governor mechanism including a motor driven centrifugally operated member, a main valve operatively connected with said centrifugally operated member, a stabilizing bushing within which said valve is located, a bushing chamber within which said bushing is located, a compensator valve located in said bushing chamber, an operative connection between said stabilizing bushing and compensator valve, 9. power piston chamber, a power piston in said power piston chamber, passages opening from said power piston chamber on opposite sides of said piston, the ends of said passages opposite said power piston chamber being controlled by said main valve, a throttle member operatively connected with said piston, a stabilizing lever having a support at one end operatively connected with said throttle member, a compensator piston supporting the opposite end of said stabilizing lever, a controlling valve for said compensator piston, passages communicating at one end with said controlling valve and with their opposite ends located for control by said compensator valve, and an operative connection between said stabilizing lever and said compensator valve.

7. A governor mechanism including a motor driven centrifugally operated member, a main valve operatively connected with said centrifugally operated member, a stabilizing bushing within which said valve is located, a bushing chamber Within which said bushing is located, a compensator valve in said bushing chamber, an operative adjustable connection between said stabilizing bushing and compensator valve, 21 power piston, a power piston chamber for said power piston, passages opening from said power piston chamber on opposite sides of said power piston, the ends of said passages opposite said power piston, chamber being controlled by said main valve, a throttle member operatively connected with said power piston, a stabilizing lever having a support at one end operatively connected with said throttle member, a compensator piston supporting the opposite end of said stabilizing lever, a compensator piston chamber for said compensator piston, passages communicating at one end with said compensator piston chamber and with their opposite ends located for control by said compensator valve, and an operative connection between said stabilizing lever and said compensator valve.

8. A governor mechanism including a motor driven centrlfugally operated member, a main valve operatively connected with said centrifugally operated member, a stabilizing bushing within which said valve is located, a bushing chamber in which said bushing is located, a com pensator valve located in said bushing chamber, a shank on said bushing extending through and screw threadedly engaged with said compensator valve, a power piston chamber, a power piston in said power piston chamber, passages opening from said power piston chamber on opposite sides of said piston, the ends of said passages opposite said power piston chamber being controlled by said main valve, a throttle member operatively connected with said power piston, a stabilizing lever having a support at one end operatively connected with said throttle member, a compensator piston supporting the opposite end of said stabilizing lever, a compensator piston chamber for said compensator piston, passages communicating at one end with said compensator piston chamber and with their opposite ends located for control by said compensator valve, and an operative connection between said stabilizing lever and said compensator valve. 9. A governor mechanism including a motor driven centrifugally operated member, a main valve operatively connected with said centrifugally operated member, a stabilizing bushing within which said valve is located, a bushing chamber in which said bushing is located, a compensator Valve in said bushing chamber, a shank extending from said stabilizing bushing through and screw threadedly engaged with said compensator valve, a power piston chamber, a power piston in said power piston chamber, passages opening from said power piston chamber on opposite sides of said piston, the ends of said passages opposite said power piston chamber being controlled by said main valve, a throttle member operatively connected with said piston, a stabilizing lever having a support at one end operatively connected with said throttle member, a compensator piston supporting the opposite end of said stabilizing lever, a compensator piston chamber for said compensator piston, passages communicating at one end with said compensator piston chamber and with their opposite ends located for control by said compensator valve, a disk secured to the shank of said stabilizing bushing, and means on said stabilizing lever engaged with said disk to operate the compensator valve and stabilizing bushing.

10. A governor mechanism including a motor driven centrifugally operated member, a main valve operatively connected with said centrifugally operated member, a stabilizing bushing within which said valve is located, a bushing chamber in which said bushing is located, a compensator valve in said bushing chamber, an operative connection between said stabilizing bushing and compensator valve, a power piston chamber, a power piston in said power piston chamber, passages opening from said power piston chamber on opposite sides of said piston, the ends of said passages opposite said power piston chamber being controlled by said main valve, a throttle member operatively connected with said piston, a stabilizing lever having a support at one end operatively connected with said piston, a compensator piston supporting the opposite end of said stabilizing lever, a compensator piston chamber for said compensator piston, passages communicating at one end with said compensator piston chamber and with their opposite ends located for control by said compensator valve, a timing valve for controlling admission of pressure to the chamber of said compensator piston, and an operative connection between said stabilizing lever and said compensator valve.

11. A governor mechanism including a motor driven centrifugally operated member, a main valve operatively connected with said centrifugally operated member, a ported stabilizing member having its ports controlled by said main valve, means for actuating said stabilizing member, a ported speed droop member having flow of fluid through its ports controlled by said main valve, a power piston, a chamber for said piston, passages opening from said chamber on opposite sides of said piston and communicating with the ports of said speed droop member, a throttle member operatively connected with said piston, and an operative connection included in the means for actuating the stabilizing member and extending between said throttle member and said speed droop member.

12. A governor mechanism including a motor driven centrifugally operated member, a main valve operatively connected with said member, a ported stabilizing member having its ports controlled by said main valve, means for actuating said stabilizing member, a ported speed droop bushing within which said main valve is located, a power piston, a chamber for said piston, passages opening from said chamber on opposite sides of said piston and communicating with the ports of said speed droop member, a throttle member operatively connected with said piston, and an operative connection included in the means for actuating the stabilizing member and extending between said throttle member and said speed droop member.

13. A governor mechanism including a motor driven centrifugally operated member, a main valve operatively connected with said centrifugally operated member, a ported stabilizing bushing having its ports controlled by said main valve, a ported speed droop bushing within which said stabilizing bushing is located, a power piston, a chamber for said piston, passages opening from said chamber on opposite sides of said piston and communicating with the ports of said speed droop bushing, a throttle member operatively connected with said piston, an operative connection between said throttle member and said speed droop bushing, and an operative connection between said throttle member and said stabilizing bushing.

14. A governor mechanism including a motor driven centrifugally operated member, a main valve operatively connected with said centrifugally operated member, a ported stabilizing bushing within which said main valve is located, a ported speed droop bushing within which said stabilizing bushing is located, the ports in said bushings being adapted to register one with another, a power piston, a chamber for said piston, passages opening from said chamber on opposite sides of said piston and communicating with the ports of said speed droop member, a throttle member operatively connected with said piston, an operative connection between said throttle member and said speed droop bushing, and an operative connection between said throttle member and said stabilizing bushing.

15. A governor mechanism including a motor driven centrifugally operated member, a main valve operatively connected with said centrifugally operated member, a ported stabilizing bushing within which said main valve is located, a

ported speed droop bushing within which said stabilizing bushing is located, the ports in said bushings being adapted to register one with another, a power piston, a chamber for said piston, passages opening from said chamber on opposite sides of said piston and communicating with the ports of said speed droop bushing, a throttle member operatively connected with said piston, an operative connection between said throttle member and said speed droop bushing, said connection including a speed droop bushing support, a swinging support, a connecting arm pivotally mounted on said swinging support and slidably engaged at one end with said speed droop bushing support and at its opposite end operatively connected with said throttle member, and an operative connection between said throttle member and said stabilizing bushing.

16. A governor mechanism including a motor driven centrifugally operated member, a main valve operatively connected with said centrifugally operated member, a ported stabilizing bushing within which said main valve is located, a ported speed droop bushing within which said stabilizing bushing is located, the ports in said bushings being adapted to register one with another, a power piston, a chamber for said piston, passages opening from said chamber on opposite sides of said piston and communicating with the ports of said speed droop bushing, a throttle member operatively connected with said piston, an operative connection between said throttle member and said speed droop bushing, said connection including a speed droop bushing support, a bell crank lever mounted on a fixed pivot, a connecting arm pivotally mounted on said bell crank lever and slidably engaged at one end with said speed droop bushing support and at its opposite end operatively connected with said throttle member, means for adjusting the bell crank lever on its support, and an operative connection between said throttle member and said stabilizing bushing.

17. A governor mechanism including a motor driven centrifugally operated member, a main valve operatively connected with said centrifugally operated member, a ported stabilizing bushing within which said main valve is located, a ported speed droop bushing within which said stabilizing bushing is located, the ports in said bushings being adapted to register one with another, a power piston, a chamber for said piston, passages opening from said chamber on opposite sides of said piston and communicating with the ports of said speed droop bushing, a throttle member operatively connected with said piston, an operative connection between said throttle member and said speed droop bushing, said connection including a speed droop bushing support, a bell crank lever mounted on a fixed pivot and comprising a supporting arm and an adjusting bar, an adjusting sleeve having slotted engagement with said bar, an adjusting spindle screw threadedly engaged with said sleeve, means for turning said spindle to effect said adjustment, and an operative connection between said throttle member and said stabilizing bushing, said supporting arm being operatively connected with said throttle member.

18. A governor mechanism including speed controlled governor means, a main valve member operatively connected with said means, a ported stabilizing member within which said main valve is located, a piston located in a piston chamber, passages opening from said chamber on opposite sides of said piston, the nds of said passages opposite said chamber being located for opening and closing by said main valve member, a throttle operating lever operatively connected with said piston, a pivotally mounted lever connected at one end with said throttle operating lever, an adjustable movable mount for said pivotally mounted lever to change its point of connection with said throttle operating lever, and an operative connection between the opposite end of said pivotally mounted lever and said stabilizing member for operation of the latter simultaneously with and in the same direction as that of movement of said main valve.

19. A governor mechanism including a motor driven centrifugally operated member, a main valve member operatively connected with said centrifugally operated member, a ported stabilizing member within which said main valve member is located, a piston located in a piston chamber, passages opening from said chamber on opposite sides of said piston, the ends of said passages opposite said chamber being located for opening and closing by said main valve member, a throttle operating lever operatively connected with said piston, a pivotally mounted lever connected at one end with said throttle operating lever, an adjustable movabl mount for said pivotally mounted lever to change its point of connection with said throttle operating lever, an operative connection between the opposite end of said pivotally mounted lever and said stabilizing member for operation of the latter simultaneously with and in the same direction as that of movement of said main valve, and a speed droop member operatively connected with said throttle operating lever for operation simultaneously therewith.

20. A governor mechanism including speed controlled governor means, a valve system comprising a valve member and a stabilizing member located one within th other and one of which is connected with said governor means for movement thereby to open and close ports in the other of said members, a valve chamber within which said stabilizing member is located, a compensator valve located in said valve chamber, a piston located in a piston chamber, passages opening from said piston chamber on opposite sides of said piston, the ends of said passages opposite said piston chamber being located for opening and closing by said valve member, a throttle member operatively connected with said piston, and an operative connection between said throttle member and said compensator valve and said stabilizing member for operation of said last mentioned valve and member.

21. A governor mechanism including speed controlled governor means, a valve system comprising a valve member and a stabilizing member located one within the other and one of which is connected with said governor means for movement thereby to open and close ports in the other of said members, a valve chamber within which said stabilizing member is located, a compensator valve located in said valve chamber and operatively connected with said stabilizing memher, a speed droop bushing located in said valve chamber, means for operating said stabilizing member, a piston located in a piston chamber, passages opening from said piston chamber on opposite sides of said piston, the ends of said passages opposite said piston chamber being located for opening and closing by said valve member, 11 throttle member operatively connected with said piston, and an operative connection between said throttle member and said compensator valve and said stabilizing member for operation of said last mentioned valve and member by said throttle member.

22. A governor mechanism including speed controlled governor means, a valve system comprising a valve member and a stabilizing member located one within the other and one of which is connected with the governor means for movement thereby to open and close ports in the other of said members, a valve chamber within which said stabilizing member is located, a compensator valve located in the end of said chamber opposite said stabilizing member, a shank on said stabilizing member extending through said compensator valve, means for adjusting the relative positions of said stabilizing member and said compensator valve, a piston located in a piston chamber, passages opening from said piston chamber on opposite sides of said piston, the ends of said passages opposite said piston chamber being located for opening and closing by said valve member, a throttle member operatively connected with said piston, and an operative connection between said throttle member and said compensator valve and said stabilizing member for operation of the last mentioned valve and member by said throttle member.

23. A governor mechanism including speed controlled governor means, a valve system comprising a valve member and a stabilizing member located one within the other and one of which is connected with said governor means for engagement thereby to open and clos ports in the other of said members, a valve chamber within which said stabilizing member is located, a compensator valve located in the end of said valve chamber opposite said stabilizing member, a shank from said stabilizing member extending through said compensator valve and threadedly connected therewith, means for turning said shank to adjust the relative positions of said stabilizing member and compensator valve, a piston located in a piston chamber, passages opening from said piston chamber on opposite sides of said piston, the ends of said passages opposite said piston chamber being located ior opening and closing by said valve member, a throttle member operatively connected with said piston, and an operative connection between said throttle member and said compensator valve and said stabilizing member for operation of said last mentioned valve and member by said throttle member.

24. A governor mechanism including a motor driven centrifugally operated member, a main valve operatively connected with said centrifugally operated member, a ported stabilizing member having its ports controlled by said main valve, means for actuating said stabilizing member, a ported speed droop member having flow of fluid through its ports controlled by said main valve. a power piston, a chamber for said piston, passages opening from said chamber on opposite sides of said piston and communicating with the ports of said speed droop member, a throttle member operatively connected with said piston, and an operative connection between said throttle member and said speed droop member, said connnection including means for adjusting the amount of relative movement between said throttle member and said speed droop member.

25. A governor mechanism including speed controlled governor means, a main valve operatively connected with said governor means, a ported speed droop member having flow of fluid through its ports controlled by said main valve, a power piston, a chamber for said piston, passages opening from said chamber on opposite sides of said piston and communicating with the ports of said speed droop member, a throttle member operatively connected with said piston, and an operative connection between said throttle member and said speed droop member, said connection including means for changing the point of engagement of said throttle member and said connection to vary the amount of relative movement between said throttle member and said connection.

IRVING M. CRAFTS. CHARLES B. TAYLOR. 

